Energy-gathered bundle type nesting plugging and wall reinforcing device and application thereof in karst cave plugging

Patent metadata

Field	Value
Publication number	US-10822913-B2
Application number	US-201916242099-A
Country	US
Kind code	B2
Filing date	Jan 8, 2019
Priority date	Feb 15, 2017
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A plugging and wall reinforcing device and a method of using thereof. The nesting plugging and wall reinforcing device comprises an external slotted metal pipe and an internal nested blasting tool, wherein the slotted metal pipe has spiral slits or straight slits cut on a pipe wall thereof; the nested blasting tool is a mandrel having a surface provided with a plurality of explosive grooves in which explosives are placed; the slotted metal pipe is disposed around the mandrel, with a movable fit therebetween. The present invention can effectively improve the plugging success rate.

First claim

What is claimed is:

1. A plugging and wall reinforcing device, comprising an external slotted metal pipe and an internal nested blasting tool, wherein the slotted metal pipe has spiral slits or straight slits cut on a pipe wall thereof; the nested blasting tool is a mandrel having a surface provided with a plurality of explosive grooves in which explosives are placed; the slotted metal pipe is disposed around the mandrel, with a movable fit therebetween.

2. The plugging and wall reinforcing device according to claim 1 , wherein the slotted metal pipe is double-layered, comprising an inner slotted metal pipe and an outer slotted metal pipe, which have a same length that is 400 mm longer than a longitudinal length of a karst cave.

3. The plugging and wall reinforcing device according to claim 2 , wherein an outer diameter of the inner slotted metal pipe is equal to an inner diameter of the outer slotted metal pipe, and an outer diameter of the outer slotted metal pipe is 5 mm to 10 mm smaller than a diameter of a drill bit for drilling a plugged well section.

4. The plugging and wall reinforcing device according to claim 3 , wherein a pipe wall of the inner slotted metal pipe is provided with a plurality of first spiral slits, which are left spiral slits or right spiral slits; and a pipe wall of the outer slotted metal pipe is provided with a plurality of second spiral slits, a turning direction of which is opposite to that of the first spiral slits;
a distance between two adjacent first spiral slits of the inner slotted metal pipe is 10 mm to 50 mm; and a distance between two adjacent second spiral slits of the outer slotted metal pipe is 10 mm to 50 mm;
a distance from a head end of the first spiral slit to a top end of the inner slotted metal pipe is 30 mm to 200 mm, and a distance from a head end of the second spiral slit to a top end of the outer slotted metal pipe is 30 mm to 200 mm; a distance from a tail end of the first spiral slit to a tail end of the inner slotted metal pipe is 30 mm to 200 mm, and a distance from a tail end of the second spiral slit to a tail end of the outer slotted metal pipe is 30 mm to 200 mm.

5. The plugging and wall reinforcing device according to claim 4 , wherein the explosive grooves of the mandrel are straight grooves.

6. The plugging and wall reinforcing device according to claim 3 , wherein a pipe wall of the inner slotted metal pipe and a pipe wall of the outer slotted metal pipe are each provided with a plurality of straight slits, and a straight slit spacing on the inner slotted metal pipe is different from a straight slit spacing on the outer slotted metal pipe;
a distance from a head end of the straight slit of the inner slotted metal pipe to a top end of the inner slotted metal pipe is 30 mm to 200 mm, and a distance from a head end of the straight slit of the outer slotted metal pipe to a top end of the outer slotted metal pipe is 30 mm to 200 mm; a distance from a tail end of the straight slit of the inner slotted metal pipe to a tail end of the inner slotted metal pipe is 30 mm to 200 mm, and a distance from a tail end of the straight slit of the outer slotted metal pipe to a tail end of the outer slotted metal pipe is 30 mm to 200 mm.

7. The plugging and wall reinforcing device according to claim 6 , wherein the explosive grooves of the mandrel are spiral grooves.

8. The plugging and wall reinforcing device according to claim 2 , wherein a pipe wall of the inner slotted metal pipe is provided with a plurality of first spiral slits, which are left spiral slits or right spiral slits; and a pipe wall of the outer slotted metal pipe is provided with a plurality of second spiral slits, a turning direction of which is opposite to that of the first spiral slits;
a distance between two adjacent first spiral slits of the inner slotted metal pipe is 10 mm to 50 mm; and a distance between two adjacent second spiral slits of the outer slotted metal pipe is 10 mm to 50 mm;
a distance from a head end of the first spiral slit to a top end of the inner slotted metal pipe is 30 mm to 200 mm, and a distance from a head end of the second spiral slit to a top end of the outer slotted metal pipe is 30 mm to 200 mm; a distance from a tail end of the first spiral slit to a tail end of the inner slotted metal pipe is 30 mm to 200 mm, and a distance from a tail end of the second spiral slit to a tail end of the outer slotted metal pipe is 30 mm to 200 mm.

9. The plugging and wall reinforcing device according to claim 8 , wherein the explosive grooves of the mandrel are straight grooves.

10. The plugging and wall reinforcing device according to claim 2 , wherein a pipe wall of the inner slotted metal pipe and a pipe wall of the outer slotted metal pipe are each provided with a plurality of straight slits, and a straight slit spacing on the inner slotted metal pipe is different from a straight slit spacing on the outer slotted metal pipe;
a distance from a head end of the straight slit of the inner slotted metal pipe to a top end of the inner slotted metal pipe is 30 mm to 200 mm, and a distance from a head end of the straight slit of the outer slotted metal pipe to a top end of the outer slotted metal pipe is 30 mm to 200 mm; a distance from a tail end of the straight slit of the inner slotted metal pipe to a tail end of the inner slotted metal pipe is 30 mm to 200 mm, and a distance from a tail end of the straight slit of the outer slotted metal pipe to a tail end of the outer slotted metal pipe is 30 mm to 200 mm.

11. The plugging and wall reinforcing device according to claim 10 , wherein the explosive grooves of the mandrel are spiral grooves.

12. The plugging and wall reinforcing device according to claim 1 , wherein the slotted metal pipe is single-layered, a distance from a head end of the spiral slit or the straight slit to a top end of the slotted metal pipe is 30 mm to 200 mm, and a distance from a tail end of the spiral slit or the straight slit to a tail end of the slotted metal pipe is 30 mm to 200 mm.

13. The plugging and wall reinforcing device according to claim 12 , wherein the slotted metal pipe is provided with the spiral slits, and the explosive grooves of the mandrel are straight grooves; or the slotted metal pipe is provided with the straight slits, and the explosive grooves of the mandrel are spiral grooves.

14. A method of using a plugging and wall reinforcing device, comprising the steps of:
drilling a borehole which intersects a karst cave, said karst cave having an upper plate and a lower plate;
1) if an external slotted metal pipe is single-layered, forming a length of the metal pipe to be 400 mm longer than a longitudinal length of a karst cave;
if the external slotted metal pipe is double-layered, selecting two metal pipes of different sizes, a wall thickness of each of the metal pipes varying with different metal materials; an inner diameter of an outer layered metal pipe is equal to an outer diameter of an inner layered metal pipe, an outer diameter of the outer layered metal pipe is 5 mm to 10 mm smaller than a diameter of a drill bit for drilling a plugged well section, and the two metal pipes have a same length that is 400 mm longer than the longitudinal length of the karst cave;
2) for the single-layered slotted metal pipe, cutting a plurality of straight slits or spiral slits on a pipe wall of the metal pipe on the ground, and leaving an upper end and a lower end of the metal pipe for 30 mm to 200 mm without cutting, thereby obtaining the single-layered slotted metal pipe;
for the double-layered slotted metal pipe, cutting spiral strips with different left and right turning directions

Assignees

• China Univ Of Petroleum—Beijing
• Univ China Petroleum Beijing

Inventors

• Zhang Yiqun
• Liu Ya
• Li Gensheng
• Huang Zhongwei
• Shi Huaizhong
• Song Xianzhi
• Sheng mao
• Ji Lu

Classifications

• F42D3/00

  Particular applications of blasting techniques {(explosive welding B23K20/08; explosive bolts or actuators F42B3/006; explosive valves F16K13/06; cutting devices actuated by explosion B23D15/145; pyrotechnical actuators F15B15/19; switching devices actuated by explosion H01H39/00)} · CPC title

• E21B33/13 Primary

  Methods or devices for cementing, for plugging holes, crevices or the like · CPC title

• E21B29/02

  by explosives or by thermal or chemical means {(freeing stuck objects by explosives E21B31/002)} · CPC title